My son's 2014 radio/nav doesnt work. Backup camera does. So from all my research it is clearly the logic board in the head unit. I see that there a few options basically to buy a new unit or a used unit. Carlink Life even sells just a used logic board. Found someone that can even fix it if you send it to them. All those options are more money than he has right now. Has anyone ever found what exactly needs to be done to fix this issue? Any videos?